Are these a drop in replacement for the MDT33 or would a crossover redesign be necessary?

Joel

They are the MDT33. It was my understanding that the name was changed as the MDT30S is now the CAT308. They just note the impedance of the tweeter in the name now.

I also have a set of Extreme 1108 which will be the same price and also in the same shape. They have Neo magnets and a slightly lower Fs of 680 vs the 700 of the ET338. They measure almost exactly the same freq wise. i will be posting these and another set of tweeters later today.